var scrolltotop={setting:{startline:100,scrollto:0,scrollduration:1000,fadeduration:[500,100]},controlHTML:'<img src="http://4.bp.blogspot.com/-SfOvoaO81Ts/UNtpxueY9mI/AAAAAAAAD0s/rJLEHrGLb2k/s1600/ico-go-up.png" style="width:48px; height:48px" />',controlattrs:{offsetx:5,offsety:5},anchorkeyword:'#top',state:{isvisible:false,shouldvisible:false},scrollup:function(){if(!this.cssfixedsupport)
this.$control.css({opacity:0})
var dest=isNaN(this.setting.scrollto)?this.setting.scrollto:parseInt(this.setting.scrollto)
if(typeof dest=="string"&&jQuery('#'+dest).length==1)
dest=jQuery('#'+dest).offset().top
else
dest=0
this.$body.animate({scrollTop:dest},this.setting.scrollduration);},keepfixed:function(){var $window=jQuery(window)
var controlx=$window.scrollLeft()+ $window.width()- this.$control.width()- this.controlattrs.offsetx
var controly=$window.scrollTop()+ $window.height()- this.$control.height()- this.controlattrs.offsety
this.$control.css({left:controlx+'px',top:controly+'px'})},togglecontrol:function(){var scrolltop=jQuery(window).scrollTop()
if(!this.cssfixedsupport)
this.keepfixed()
this.state.shouldvisible=(scrolltop>=this.setting.startline)?true:false
if(this.state.shouldvisible&&!this.state.isvisible){this.$control.stop().animate({opacity:1},this.setting.fadeduration[0])
this.state.isvisible=true}
else if(this.state.shouldvisible==false&&this.state.isvisible){this.$control.stop().animate({opacity:0},this.setting.fadeduration[1])
this.state.isvisible=false}},init:function(){jQuery(document).ready(function($){var mainobj=scrolltotop
var iebrws=document.all
mainobj.cssfixedsupport=!iebrws||iebrws&&document.compatMode=="CSS1Compat"&&window.XMLHttpRequest
mainobj.$body=(window.opera)?(document.compatMode=="CSS1Compat"?$('html'):$('body')):$('html,body')
mainobj.$control=$('<div id="topcontrol">'+mainobj.controlHTML+'</div>').css({position:mainobj.cssfixedsupport?'fixed':'absolute',bottom:mainobj.controlattrs.offsety,right:mainobj.controlattrs.offsetx,opacity:0,cursor:'pointer'}).attr({title:'Scroll Back to Top'}).click(function(){mainobj.scrollup();return false}).appendTo('body')
if(document.all&&!window.XMLHttpRequest&&mainobj.$control.text()!='')
mainobj.$control.css({width:mainobj.$control.width()})
mainobj.togglecontrol()
$('a[href="'+ mainobj.anchorkeyword+'"]').click(function(){mainobj.scrollup()
return false})
$(window).bind('scroll resize',function(e){mainobj.togglecontrol()})})}}
scrolltotop.init()